Rotary casting



Feb. 15, 1927,

A- M. HENRY ROTARY CASTING Filed Feb. z, 1924 5 Sheets-Sheet l i 1,617,904 Feb. 15, 1927 A, M, HENRY ROTARY CASTING Filed Feb.2, 1924 3 Sheets-Sheet 2 Patented Feb. 15, 1927.

UNITED STATES PATENT oFFicE,

AUGUSTUS M. HENRY, OF BROOK LYN, NEW Y'oRK, Assreivoa 'ro WILLIAM w. WEIT- LING, TRUSTEE, OF COLLEGE POINT, NEW YORK.

ROTARY CASTING.

Application led February 2, 1924. Serial No. 690,289.

This invention relates to im provements in.

rotary casting, and' has particular reference to a method and apparatus for casting car wheels andv like metals; the invention having,

articles made of ferrous broadly, parconcerned.

As to car wheels particularly,

problems are presented' in r since according to present pr hole is presented as compared otary casting, actice a small to the bulk of material surrounding said hole (keeping in mind especially the thickness of the casting between the edge of the hole and the periphery of the wheel). where molds are employed `i process of metal or the ordinary foundry sand an This is. especiallyJ true n y the casting having linings other: than d such linings are quicker heat-absorptive types than the ordinary foundry sand.

`These problems have to do with controlling 'the distributor means for IJthe molten metal, o

particularly or feeding r `the mold, or

both, in such a manner that in makingunitar inte al or sin le-cast casfings orthe kind bove in possible to economically and, at the same the possibility of the metal distinct layersA or arcuate or ferrous metal en tioned, it is lproduce the same rapidly and time, preclude congealing in annular striations, commonly known as cold-shots.

Accordingly, Vthe present i vides an improved apparatus a accomplishing the above, pur a charge of mold at a fed into the mold cavity the which 'the metal Hows is rotat nvention prond method for poses whereinmolten metal is injected into the high velocity and as it isbein spout throug ed.

It is further Aproposedn to pour the metal into the mold by a rotation of the feeding spout so that the metal will be delivered tngentiall Tith respect to the peripheral' and to simultathemold to obviate bility of the ametal becoming chilled during plane of t e mold/ cavity v neously heatA the casting operation.

the possi- A'further object is to provide a which the con graduated an elation of the molten metal is controlled radially with respect to the center ofthe casting by an applicatonvof a varying dw" t'o the walls `of the mold cav'it v u `heat ycontrol special --intoY-said tube. However,

vend 16 of the inner The above and-other objects will appear more clearly from the following detailed description when taken in connection with the accompanying drawings, preferred embodiments of the inventive idea. In the drawings- Figure l is a Side elevation, partly in sec. tion, `of an apparatus constructed in accordwhich illustrate Figure 4 is a view similar to Figure 2 showing a different form of mold; and

Figure 5 is of Figure 4.

The apparatus shown in Figure 1 includes a container 5 having a lining 6 Iof suitable heat-resisting material.

Molten metal 7 is poured into the container 5 preparatory to charges thereof being ejected therefrom to tus which preferablysupported by a sliding block 9 movable in guideslO formed in the bottom of the lining 6.

lEXtended into the container 5 is a lever 12, pivoted intermediate its ends at 13 and having a slotted connectionv 11 with the sliding block 9, so that as the'lever 12 is actuated about its pivot a longitudinal movement of the sliding block and plunger 8 with 'res ct to the bottom of the container will be e ected. 'The upper end of the lever 12 has connected thereto at l5 a plunger rod 14 which extends into a mechanism conventionally illustrated at 34, which may be hydraulically or otherwise operated to quickly and forcibly eject the plunger rod 14 from the mechanism in such'manner as to impart a rocking movement to the lever 12.

Normally the effective end 8 closes ythe inner enlarged endl6 of the inner section 17' of 4 the delivery tube so as to prevent the molten metalV from flowing when a charge is the mold by an apparancludes a plunger 8` of the vplunger i 70 a section taken on line 5-5-5 y,

to be ejected from the container 5 the mechanism 34 first operates to retract the rod 14 slightly into the mechanism to move the plunger tothe left, as shown in Figure 1. A charge of the metal 7 then flows into the section, whereupon the sliding block and plunger 8 are moved to the right to force the charge through the inner section 17. By reason ot the action of the mechanism above described the conlplete charge of molten metal W1ll he forced through the delivery tube at an exceedingly high velocity.

The delivery tube further lncludes an outer section 18 surrounding the inner section 17 in spaced relation thereto to form a non-heatconducting air space betweenthe sections. The inner section 17 is provided at intervals with projections 19 which are designed to prevent sagging of the inner section due to the excessive heat applied thereto by the molten metal passing through the same. The outer or delivery ends of the sections 17 and 18 are bent downwardly at an angle of approximately 45; and arranged in longitudinal alignment with the inner section 17 is the delivery spout 20.

Referring now to Figs. 2 and 3, spoilt 20 has its discharge end bent laterally at substantially right angles to the longitudinal axis of said spout.

The inlet end 21 of the spout is lared to receive the adjacent end of the inner section 17 so that the metal from said section will readily ilow into the spout.

The spout 20 is supported in rings 22 arranged in spaced relation in a rotatable sleeve 23, one end of which sleeve is secured to a suitable bearing 24 revoluble about the outer'section 18 of the delivery tube. A suitable gear 33 is secured to the sleeve 23 intermediate the ends thereof and is connected to a suitable mechanism (not shown) utilized to impart high-speedrotary movement to the sleeve 23 whereby a similar movement of the spout 20 is produced. j

The permanent mold shown in Fioure 2, wherein a cast car-wheel is indicated at C, includes the complemental sections 25 and 26, preferably constructed mainly of nichrome and provided therein with opposed recesses 25a and 26, respectively.

Embedded in each section of the mold contiguous to the molding cavity therein 1s a layer 35 of a heat-insulative and electrically non-conductive material, such as alundum paste or cement, and in each layer 35 there is placed a resistance wire 36 formed 1n a continuous spiral, the convolutlons of which are spaced and insulated from the metal portions of the mold by the layer 35. The wires 36 of the two sections of lthe mold combine to practically surround the cavity formed by the recesses in Said sections and have their leads V and V eX- Atended through the sections and connected to the contact rings 27 and 27, respectively.

Referring to Figure l, the sections ofthe mold are held together by threaded rods ,.28 which are actuated in a manner fully disclosed in U. S. Letters Patentto me No. 1,501,338, to maintain the sections of the mold in cooperative relation and permit thel section 26 to be moved relative to the section 26 whenever desired. The .section 25 of the mold has a shaft 3U connected thereto, which shaft may be driven by an electric motor or any 'other convenient means conventionally illustrated at 37.

Again examining Figures 2 and 3, the axis of rotation of the shaft 30 and that of the spout 2() are coincident so that as the mold and spout are rotated the molten metal from the spout will be delivered and evenly distributed into the cavity in the mold. The spout and mold are rot-ated in the same direction and, in accordance With the present invention as preferably carried out, the spout is'driven at a speed very, very slightly decreased with respect to that of the mold so that the metal from the spout will be tangent-ially delivered into the mold cavity but so that the entire charge of metal Will be delivered to the mold during about one revolution thereof.

In the form of mold shown in Figures 4 and 5, the two mold sections thereof are so constructed as to permit of variable cooling effects and produce a radially graduated congelation control. For this purpose the centers of the sections of the mold have mounted therein the carbon blocks 38 and 39, incidentally utilized to case-harden the hub portion of the casting C. As in the construction shown in Figure 2, each mold section includes a metal member; but in Figure 4 said members marked 25B and 26B are shaped to permit employment of carbon mold members 38 and 39. Also, as in Figure 2, a resistance coil 40 is embedded in an insulating bed 4l in each section of the mold and the plane of each coil and bed is arranged diagonally with respect to the center ptlane ofthe mold cavity with the convolutions of the coils positioned nearest to the cavity at points contiguous to the hub portion of the casting. In this manner a graduated heat Will be applied to the molten metal as it is being cast, in such a Way that the outer portion of the casting C will be chilled, and such chill will gradually disappear toward the hub of the car-wheel. Desirably, for obtaining greater strength throughout the entire wheel, the peripheries ot' the carbon blocks 38 and 39 are corrugated and the convolutions of the resistance wires 40 are also corrugated, as indicated in Figure 4.

I claim:

1. The method of casting which consists in rotating a mold, injectin a charge of molten metal thereinto, an heating said' mold in different degrees in different parts.

2. The method of casting which consists in rotating a mold, injecting a charge of Lemaire molten metal thereinto, and heating said mold in different degrees at different radially related parts.

3. The method of casting which consists in rotating n mould, injecting a charge of molten metal thereinto, and modifying the temperature ot' said mold, by means other than the molten metal, simultaneously in dil'ermt degrees at various points diflerent distances from the axis of rotation of the mould.

4. The method ot' casting which consists molten metal thereinto, and C'heatting said mold in different de rees at different circumferentially relate parts.

5. The method of casting which consists in rotating a mould, injecting a charge of molten metal thereinto, and modifying the temperature of said mold, by means other than the molten metal, simultaneously in. different degrees at various points aroundthe mould axis, that is, circumferentially of the mould.

AUGUSTUS M. HENRY.. 

